So, the government has a good system of control or can educate the people, the forests will slowly disappear.
A. as long as
B. when
C. unless
D. every time
网友回答
A. as long as
B. when
(答案→)C. unless
D. every time
解析：连词辨析。 A. 只要 B. 既然 C. 除非；如果不 D. 每当。句意：因此，除非政府有一个好的控制系统或者能教育人们，否则森林会慢慢消失。故选C。